Butterfly Valve
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VALTECCN is an industrial butterfly valve manufacturers and suppliers that provide all kinds of butterfly valves. Our butterfly valve factory producing concentric butterfly valves, eccentric (double or triple Offset) butterfly valves, wafer type butterfly valves, lug(semi or full) butterfly valves, flanged flanged butterfly valves, PTFE lined butterfly valves. Our butterfly valve factory in China adhere to JIS, JPI, API, ASME, EN, DIN, ISO standards, under a ISO9001 Quality Assurance program, it assures our butterfly valves are produced all according or exceed the international standards. Our products have been sold worldwide for a wide range of applications in natural gas, oil, oil refining, chemical, marine, power generation and pipeline transportation industries.


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    All You Need To Know About: Butterfly Valve Wikipedia

    What Are Butterfly Valves?

    Butterfly Valve Working Principle

    Butterfly Valve Working Principle
    Components of Butterfly Valve

    Components of Butterfly Valve

    A - Bushing

    B - O-ring

    C- Stem / Shaft:
    Valve shafts, also known as stems, are the components that connect the disc to the actuator mechanism and transmit torque through themselves.

    D - Disc:
    There is a disc attached to the valve body that acts as a gate to stop or throttle fluid flow; this can be compared to a gate on a gate valve or a ball on a ball valve. Bores are usually cut into the disc so that the stem, or shaft, can be received. In order to enhance flow, sealing, and/or operating torque conditions, many variations in disc design, orientation, and material are available.

    E- Seat:
    Seen as a lining to the internal body of the butterfly valve, the seat is a type of rubber (EPDM, NBR, FKM, etc.) or metallic seal for preventing leakages. The design of the butterfly valve seat may differ from different manufacturers. It may even be locked, pressed, or bonded into the body of the valve.

    F- Body:
    Located between the pipe flanges, the body of the butterfly valve holds all the other parts of the butterfly valve in place. It can fit two pipe flanges —— flanged, lug, and wafer connections are the most common.

    Applications of Butterfly Valve

    Butterfly Valve Applications

    Butterfly valves are present in almost all industries that need flow control.
    These could be the following:

    • Steam
    • Chemical
    • Plumbing
    • Marine
    • Sea Wafer
    • Slurry Application
    • Water Supply
    • Wastewater Treatment
    • Hydro Power Plant
    • Corrosive Applications
    • Oil and Gas Industries
    • Fuel Handling Systems
    • Cooling and Circulating Water
    • Agricultural Irrigation

    Butterfly Valve Types By Valve Body Design

    Wafer Type Butterfly Valve

    Wafer Type Butterfly Valve

    Wafer butterfly valves are designed to be installed between flanges, with a short face-to-face dimension in relation to the pipeline diameter. These valves cannot be used for dead-end service, which requires additional isolation valves when shut down for maintenance. Wafer options are lighter and cheaper than lug style and often used in lower pressure applications.

    Lug Type Butterfly Valve

    Lug Type Butterfly Valve

    Lug butterfly valves are designed to be bolted to one or both flanges using fasteners threaded into lug protrusions on the valve body, with a short face-to-face dimension in relation to the pipeline diameter. These valves can also be used in dead-end service depending on seat design but may be de-rated and can be heavier than wafer style.

    Double Flange Butterfly Valve

    Double Flange Butterfly Valve

    Double flanged butterfly valves are designed with flanges on both ends of the body to secure the valve to mating flanges on the pipe with bolts or studs and nuts. They can be used in dead-end service; Double-flanged butterfly valves are more popular in butterfly valves with larger sizing.

    Butterfly Valve Types By Material

    Ductile Iron Butterfly Valve

    Ductile Iron Butterfly Valve

    The most notable benefit of ductile iron butterfly valves is that they are extremely well equipped to handle harsh conditions and have a high tensile strength. They are resistant to high pressure and corrosive media which makes them well equipped for different industries.

    Stainless Steel Butterfly Valve

    Stainless Steel Butterfly Valve

    Stainless steel is a steel alloy that contains higher chromium content (10.5-30%). Stainless steel butterfly valves are excellent for handling acidic and corrosive fluids, a wide range of pressures and temperatures. Austenitic stainless steel is ideal for cryogenic processes, while duplex stainless steel is used for higher pressure. 316 SS is the preferred stainless-steel grade.

    Cast Iron Butterfly Valve

    Cast Iron Butterfly Valve

    Cast iron made of an alloy containing iron and 2-4% carbon, most commonly used in applications that require high amounts of flow along with quick, tight shut off. Have excellent tensile strength, and butterfly valves that can be cast into different shapes according to customer needs have meet your industrial needs at high temperature and pressure.

    Carbon Steel (WCB) Butterfly Valve

    Carbon Steel (WCB) Butterfly Valve

    Carbon steel is a steel alloy that has a higher carbon content of up to 2.5%. Carbon steel grades for butterfly valves are ASTM A216 WCB (Welded Cast B-grade) and LCC (Low Carbon Content). WCB grade is used for high-temperature applications while the LCC is used at low temperatures.

    Aluminum Butterfly Valve

    Aluminum Butterfly Valve

    An aluminum body provides strength and durability at half the weight of other metal flanged flow-adjustment valves, making them an ideal choice for the transportation industry.

    Plastic Butterfly Valve

    Plastic Butterfly Valve

    Made from rigid plastic materials, lightweight and less expensive. Generally suited to plumbing, water and wastewater treatment, aggressive chemicals, and are available in a range of materials such as FRPP, PVDF, UPVC, CPC, CPVC, and PPH. Various seal materials are also available depending on the process media.


    Butterfly Valve Types By Actuation

    Manual Butterfly Valve

    Manual butterfly valves are of two types: lever handle and gear butterfly valves but the basic process of usage remains the same. Manual operating valves are used in smaller spaces and systems to effectively regulate media flow.

    Automatic Butterfly Valve

    Automated butterfly valves are divided into electric butterfly valves and pneumatic butterfly valves, remote control valve, allowing you to implement automation applications more easily and quickly, and improve production efficiency.

    Butterfly Valve Types By Disc Closure Design

    Concentric / Zero Offset Butterfly Valve

    In the concentric valve design, the stem passes through the center of the gate into the pipe bore which is also located at the center of the valve. To seal the flow, concentric valves should have a very flexible seat rubber because the disk touches the seat first when rotated in a quarter turn.

    Since the disk and the seat are always in contact, the body of the valve is less prone to corrosion as the media flows. It only touches the seat that acts like a sleeve.

    The concentric butterfly valve is regular or widely used. Low-pressure applications are typical uses of this valve. These valves are also known as a central butterfly valve, centrerline butterfly valve, resilient seated butterfly valve, rubber seated butterfly valve, or soft seated butterfly valve.

    Double Eccentric / Double Offset Butterfly Valve

    In double offset butterfly valves, the stem axis is offset behind the centerline of the seat and the body (first offset), then the stem axis is further offset from the vertical centerline of the valve (second offset). When the disc is opened, the seat is lifted from the seal; this reduces the friction during the first and last 10 degrees of the valve opening and closing, respectively. This results in a smoother valve operation, better sealing capability, and longer service life than the zero offset butterfly valve.

    Like zero offset butterfly valves, double offset butterfly valves use a soft seat. They are available in moderate pressure and temperatures ratings, which are capable of withstanding higher pressures and temperatures than the zero offset butterfly valves in liquid and gas pipelines.

    Double offset butterfly valves are typically used in water purification, wastewater treatment, HVAC, and fire protection systems.

    Triple Eccentric / Triple Offset Butterfly valve

    In triple offset butterfly valves, an angular offset in the body sealing cone axis is made in addition to the first two offsets (third offset). This is accomplished by using the right-angled conical profile of the seat coupled with a matching profile at the disc edge. This offset eliminates the contact of the seat and the disc during valve opening and closing, hence, friction is also eliminated. Contact only occurs during the full closure of the butterfly valve; this also acts as a mechanical stop to prevent the disc from rotating further.

    The design of triple offset butterfly valves requires the use of metal seats. they can withstand high temperatures and high fluid pressures; this minimizes valve wear, longer life.

    Triple offset butterfly valves are ideal in handling high-pressure and superheated steam, high-temperature liquids and gases, and corrosive chemicals that cannot be handled by butterfly valves with soft seats.

    Difference between concentric, double-offset, and the triple-offset butterfly valve

    Difference between concentric, double-offset, and the triple-offset butterfly valve

    Concentric (Zero-Offset): The shaft is located in the center of the disc.

    Double-Offset: The shaft is offset form its body center line + shaft offset form pipe center line.

    Tripple-Offset: The shaft is offset form ites body center line + shaft offset form pipe center line + conical offset shape in its seal and disc connection.

    Butterfly Valve Types By Seat

    Butterfly valves can be metal-to-metal seated, soft seated, or with a fully lined body and disc.

    Soft or Resilient Seated Butterfly Valves

    Resilient seated butterfly valve (also known as concentric butterfly valve). The stem is centred in the middle of the valve disc, exerting a high degree of contact with the rubber seat to effect a seal, for all industries with less critical applications and low pressure systems. The seat material may be made from a wide variety of various elastomers or polymers, such as EPDM, Buna-N, PTFE(Teflon)/RPTFE, VITON, etc.

    Metal Hard Seated Butterfly Valves

    Between the body and the flavor of metal seated butterfly valves use a sealing surface made of metal.triple offset design to prevent seat wear, superior performance, lower maintenance, and a longer life for your valves. Mainly used in industries that work under extreme pressure and temperatures.

    Considerations When Buying Butterfly Valves

    There are many factors to consider when buying industrial butterfly valves.

    Flow Medium

    Perhaps this is the most important consideration. The media that flows through the valve greatly affects the lifespan of the valve. Furthermore, the wrong kind of media may cause damage to the valve. Some media are corrosive, others are abrasive.
    Some have high-pressure levels while others have low temperatures. Knowing the media and how it works with the valve material is an important consideration.

    Pipe Considerations

    Butterfly valves should be able to handle the weight of the piping system:The valve diameter with the same size as the pipes can withstand high pressure. But when the valve diameter is smaller than the pipe’s, there is the tendency for the valve to bend. The bending may cause external and internal leakage.

    Materials Used

    The material of the valve body, disc, and seat should be able to withstand the corrosiveness of the passing medium. For example, use corrosion-resistant materials if the media is acidic. High-pressure media uses valves made of an alloy that can resist high temperature and pressure levels.
    Choosing the wrong kind of material means shorter valve lifespan.


    Whether manual actuation is the best option or not, actuation is also a factor worth considering. Process pipelines require large valves. Manual actuation is not suited for a large valve. Instead, use pneumatic or automated valves.

    End Connections

    The end connections of the valves often follow that of the pipe. Having said that, compatibility is of the two is vital. A flanged end valve is not the required one when the pipe employs a thread.

    Industry Standards

    Butterfly valves follow certain standards. With that in mind, there are standards for the material of the valve. There are standards for the end connections. It is important that butterfly valves follow the rigid regulations imposed by international bodies. This ensures safety and proper valve installation.

    Choose Reliable Butterfly Valve Manufacturers

    Choose reliable butterfly valve manufacturers is the focal point when thinking of buying industrial butterfly valves.
    High quality butterfly valve manufacturer should provide the customer with the right valve. Responsible for informing the customer about the industry standards and other considerations. He should be able to provide the right product with the right price point. He should also aware of customer needs, the right type of valve for a particular industrial application,Save costs, save time, and provide perfect product after-sales service.

    Whether you are looking for manufacturers of butterfly valves, high performance butterfly valves, and butterfly valves of every type, VALTECCN is the premier source for you.
    As one of the leading butterfly valve manufacturers in China, VALTECCN VALVE exports best-quality butterfly valves at the competitive rates.
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